/*
 * Copyright (c) 2010, Michael Hengler (developer (at) hengler (dot) de),
 * Nikolaus Moll (developer (at) miblounge (dot) net).
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * * Neither the name of the Jombi project nor the
 * names of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL JOMBI BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */
package net.miblounge.jombi.impl.util;

import org.jowidgets.common.types.AlignmentHorizontal;

public final class StyleSheetUtil {

	private StyleSheetUtil() {}

	public static String buildStyleAttribute(final String oldStyle, final String attribute, final String value) {
		String style = oldStyle;
		// add a semicolon
		if ((style.length() > 0) && (style.charAt(style.length() - 1) != ';')) {
			style = style + ';';
		}
		final int pos = style.toLowerCase().indexOf(attribute.toLowerCase());
		if (pos >= 0) {
			final int endpos = pos + attribute.length();
			// go to next semicolon...
			final int semicolon = style.indexOf(';', endpos);
			final String firstPart = style.substring(0, pos);
			final String lastPart = style.substring(semicolon + 1);
			style = (firstPart + lastPart).trim();
		}

		if (value != null) {
			style = style + ' ' + attribute;
			if (!style.equals("")) {
				style = style + ':' + value;
			}
		}

		if (!style.endsWith(";")) {
			style = style + ';';
		}

		return style;
	}

	public static String convert(final AlignmentHorizontal alignmentHorizontal) {
		if (AlignmentHorizontal.CENTER.equals(alignmentHorizontal)) {
			return "text-align:center;";
		} else if (AlignmentHorizontal.LEFT.equals(alignmentHorizontal)) {
			return "text-align:left;";
		} else if (AlignmentHorizontal.RIGHT.equals(alignmentHorizontal)) {
			return "text-align:right;";
		} else {
			throw new IllegalArgumentException("Alignment '" + alignmentHorizontal + "' is unknown");
		}
	}

	public static String getAttribute(final String style, final String attribute) {
		final int pos = style.indexOf(attribute);
		if (pos < 0) {
			return "";
		}

		String subString = style.substring(pos + attribute.length()).trim();
		if (subString.startsWith(":")) {
			subString = subString.substring(1);
		}

		final int delimiter = subString.indexOf(";");
		if (delimiter > 0) {
			subString = subString.substring(0, delimiter).trim();
		}

		return subString;
	}

}
